Electrical buzzing/squeal from back of TV

I own a 42" JVC plasma TV (manufactured in October 2004) that has recently started to make an annoying buzzing/squealing noise especially when there is a lot of white being displayed. Any advice on what needs to be replaced or if it can be fixed would be appreciated.Note, I live in Fort Worth, Texas, so this is not an altitude problem.Noise is present with any input (HDMI, component, SVID etc) and with speakers muted. Sounds like some electrical component is nearing the end of its life!

I sweated the solder joints on the cooling sinks of the power transistors (circuit board at top right of TV looking from behind). Definitely reduced the noise by a huge amount and the TV is useable again at low volumes without that irritation.

I sweated the solder joints on the cooling sinks of the power transistors (circuit board at top right of TV looking from behind). Definitely reduced the noise by a huge amount and the TV is useable again at low volumes without that irritation.

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Yeah, I was going to suggest power supply issue. Plasmas IMHO, are not worth spending the money to fix. Its the reason why they are so cheap these days in comparison to LCD's. I had a 50" Samsung Plasma that went out on me within 2 years (E Buffer board and XMain problem). Its not about the manufacturer but more about the Plasma technology. Do a few searches about plasma and you will find a lot of problems with these tv's. Id say cut your losses, sell the TV for parts and buy a more reliable technology

Samsung states - A buzzing sound from your plasma TV is normal. It is caused by the electrical charges used to create the images on the screen. The buzzing, however, should not be so loud that you can hear it when the volume on the TV is set at normal levels.It is also important to determine the type of buzzing sound. A sound like a ground hum is completely normal. This buzzing can originate near the power cord connection or from the SMPS board position on the upper back of the TV. The buzz will be more audible as contrast increases on the screen, most notably when displaying an all white screen. If the buzzing sound is loud, you may have the Contrast set too high. Lower the contrast to reduce or eliminate the buzzing.You may also have loud buzzing if the rear of your Plasma TV is too close to a wall or other hard surface. Try moving your TV away from the wall until the buzzing is minimized. [1]If the buzzing is at a higher frequency and resembles a crackling sound (like the sound of Velcro being pulled apart), and originates from the upper middle back of the TV, you likely have a failing SMPS board. Place a support call with Samsung to have the SMPS board replaced.FP-T5084 Have a known buzzing problem with a very simple fix.If the buzzing is coming from the left or right sides of the rear and the volume can be changed by pressing lightly on those locations, you are probably hearing the vibration of the grounding springs on the back panel. Call Samsung (or whoever) and have a technician confirm the problem. The easiest fix is to insulate the offending spring by applying some felt tape.